干旱区生态环境知识资源中心(Arid): Themechanism of soil nitrogen transformation under different biocrusts to warming and reduced precipitation: From microbial functional genes to enzyme activity

Arid

DOI	10.1016/j.scitotenv.2020.137849
	Themechanism of soil nitrogen transformation under different biocrusts to warming and reduced precipitation: From microbial functional genes to enzyme activity
	Hu, Rui 1; Wang, Xin-ping1 ; Xu, Jun-shan 2; Zhang, Ya-feng 1; Pan, Yan-xia 1; Su, Xue 2
通讯作者	Hu, Rui
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
ISSN	0048-9697
EISSN	1879-1026
出版年	2020
卷号	722
英文摘要	Soil nitrogen (N) mineralization is a microbially-mediated biogeochemical process that is strongly influenced by changing climates. However, little information is available on the mechanisms behind the response of N mineralization to prolonged warming coupled with drought in soils covered by biocrusts. We used open top chambers to investigate the rate of soil N transformation (ammonification, nitrification and mineralization), enzyme activity and gene abundance in response to warming coupled with reduced precipitation over three years (2016-2018). Warming and drought significantly reduced the N transformation rate, extracellular enzyme activity, and gene abundance in moss-covered soil. For cyanobacteria-covered soil, however, it inhibited enzyme activity and increased the abundance of the nitrification-related genes and therefore nitrification rate. Our treatments had no obvious effects on N transformation and enzyme activity, but reduced gene abundance in bare soil. Biocrusts may facilitate N transformation while the degradation of moss crust caused by climate warming will dampen any regulating effect of biocrusts on the belowground microbial community. Furthermore, belowground microbial communities can mediate N transformation under ongoing warming and reduced precipitation by suppressing ammonification- and nitrification-related gene families, and by stimulating nitrification-related gene families involved in cyanobacteria-covered soil. This study provides a basis for identifying the functional genes involved in key processes in the N cycle in temperate desert ecosystems, and our results further highlight the importance of different biocrusts organisms in the N cycle in temperate deserts as Earth becomes hotter and drier. (C) 2020 Published by Elsevier B.V.
英文关键词	Warming N transformation Biocrusts Microbial functional genes Enzyme activity
类型	Article
语种	英语
国家	Peoples R China
收录类别	SCI-E
WOS记录号	WOS:000535472600010
WOS关键词	NET N MINERALIZATION ; TENGGER DESERT ; ORGANIC-CARBON ; ELEVATED CO2 ; SEASONAL-VARIATION ; PLANT DIVERSITY ; GROWING-SEASON ; SAND DUNES ; CRUSTS ; TEMPERATURE
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/319347
作者单位	1.Chinese Acad Sci, Shapotou Desert Res & Expt Stn, Northwest Inst Ecoenvironm & Resources, Lanzhou, Peoples R China; 2.Northwest Normal Univ, Lanzhou, Peoples R China
推荐引用方式 GB/T 7714	Hu, Rui,Wang, Xin-ping,Xu, Jun-shan,et al. Themechanism of soil nitrogen transformation under different biocrusts to warming and reduced precipitation: From microbial functional genes to enzyme activity[J],2020,722.
APA	Hu, Rui,Wang, Xin-ping,Xu, Jun-shan,Zhang, Ya-feng,Pan, Yan-xia,&Su, Xue.(2020).Themechanism of soil nitrogen transformation under different biocrusts to warming and reduced precipitation: From microbial functional genes to enzyme activity.SCIENCE OF THE TOTAL ENVIRONMENT,722.
MLA	Hu, Rui,et al."Themechanism of soil nitrogen transformation under different biocrusts to warming and reduced precipitation: From microbial functional genes to enzyme activity".SCIENCE OF THE TOTAL ENVIRONMENT 722(2020).